#define HASHLEN 16
typedef char HASH[HASHLEN];
#define HASHHEXLEN 32
typedef char HASHHEX[HASHHEXLEN+1];
#define IN
#define OUT

#ifdef  __cplusplus
extern "C" {
#endif

/* calculate H(A1) as per HTTP Digest spec */
void DigestCalcHA1(
	IN char * pszAlg,
	IN char * pszUserName,
	IN char * pszRealm,
	IN char * pszPassword,
	IN char * pszNonce,
	IN char * pszCNonce,
	OUT HASHHEX SessionKey
	);

/* calculate request-digest/response-digest as per HTTP Digest spec */
void DigestCalcResponse(
	IN HASHHEX HA1,           /* H(A1) */
	IN char * pszNonce,       /* nonce from server */
	IN char * pszNonceCount,  /* 8 hex digits */
	IN char * pszCNonce,      /* client nonce */
	IN char * pszQop,         /* qop-value: "", "auth", "auth-int" */
	IN char * pszMethod,      /* method from the request */
	IN char * pszDigestUri,   /* requested URL */
	IN HASHHEX HEntity,       /* H(entity body) if qop="auth-int" */
	OUT HASHHEX Response      /* request-digest or response-digest */
	);

#ifdef  __cplusplus
};
#endif